source: vendor/perl/5.8.8/regexp.h

/*    regexp.h
 *
 *    Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
 *    by Larry Wall and others
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/*
 * Definitions etc. for regexp(3) routines.
 *
 * Caveat:  this is V8 regexp(3) [actually, a reimplementation thereof],
 * not the System V one.
 */


struct regnode {
    U8  flags;
    U8  type;
    U16 next_off;
};

typedef struct regnode regnode;

struct reg_substr_data;

struct reg_data;

typedef struct regexp {
        I32 *startp;
        I32 *endp;
        regnode *regstclass;
        struct reg_substr_data *substrs;
        char *precomp;          /* pre-compilation regular expression */
        struct reg_data *data;  /* Additional data. */
        char *subbeg;           /* saved or original string 
                                   so \digit works forever. */
        U32 *offsets;           /* offset annotations 20001228 MJD */
        I32 sublen;             /* Length of string pointed by subbeg */
        I32 refcnt;
        I32 minlen;             /* mininum possible length of $& */
        I32 prelen;             /* length of precomp */
        U32 nparens;            /* number of parentheses */
        U32 lastparen;          /* last paren matched */
        U32 lastcloseparen;     /* last paren matched */
        U32 reganch;            /* Internal use only +
                                   Tainted information used by regexec? */
        regnode program[1];     /* Unwarranted chumminess with compiler. */
} regexp;

#define ROPT_ANCH               (ROPT_ANCH_BOL|ROPT_ANCH_MBOL|ROPT_ANCH_GPOS|ROPT_ANCH_SBOL)
#define ROPT_ANCH_SINGLE        (ROPT_ANCH_SBOL|ROPT_ANCH_GPOS)
#define ROPT_ANCH_BOL           0x00001
#define ROPT_ANCH_MBOL          0x00002
#define ROPT_ANCH_SBOL          0x00004
#define ROPT_ANCH_GPOS          0x00008
#define ROPT_SKIP               0x00010
#define ROPT_IMPLICIT           0x00020 /* Converted .* to ^.* */
#define ROPT_NOSCAN             0x00040 /* Check-string always at start. */
#define ROPT_GPOS_SEEN          0x00080
#define ROPT_CHECK_ALL          0x00100
#define ROPT_LOOKBEHIND_SEEN    0x00200
#define ROPT_EVAL_SEEN          0x00400
#define ROPT_CANY_SEEN          0x00800
#define ROPT_SANY_SEEN          ROPT_CANY_SEEN /* src bckwrd cmpt */

/* 0xf800 of reganch is used by PMf_COMPILETIME */

#define ROPT_UTF8               0x10000
#define ROPT_NAUGHTY            0x20000 /* how exponential is this pattern? */
#define ROPT_COPY_DONE          0x40000 /* subbeg is a copy of the string */
#define ROPT_TAINTED_SEEN       0x80000
#define ROPT_MATCH_UTF8         0x10000000 /* subbeg is utf-8 */

#define RE_USE_INTUIT_NOML      0x0100000 /* Best to intuit before matching */
#define RE_USE_INTUIT_ML        0x0200000
#define REINT_AUTORITATIVE_NOML 0x0400000 /* Can trust a positive answer */
#define REINT_AUTORITATIVE_ML   0x0800000 
#define REINT_ONCE_NOML         0x1000000 /* Intuit can succed once only. */
#define REINT_ONCE_ML           0x2000000
#define RE_INTUIT_ONECHAR       0x4000000
#define RE_INTUIT_TAIL          0x8000000

#define RE_USE_INTUIT           (RE_USE_INTUIT_NOML|RE_USE_INTUIT_ML)
#define REINT_AUTORITATIVE      (REINT_AUTORITATIVE_NOML|REINT_AUTORITATIVE_ML)
#define REINT_ONCE              (REINT_ONCE_NOML|REINT_ONCE_ML)

#define RX_MATCH_TAINTED(prog)  ((prog)->reganch & ROPT_TAINTED_SEEN)
#define RX_MATCH_TAINTED_on(prog) ((prog)->reganch |= ROPT_TAINTED_SEEN)
#define RX_MATCH_TAINTED_off(prog) ((prog)->reganch &= ~ROPT_TAINTED_SEEN)
#define RX_MATCH_TAINTED_set(prog, t) ((t) \
                                       ? RX_MATCH_TAINTED_on(prog) \
                                       : RX_MATCH_TAINTED_off(prog))

#define RX_MATCH_COPIED(prog)           ((prog)->reganch & ROPT_COPY_DONE)
#define RX_MATCH_COPIED_on(prog)        ((prog)->reganch |= ROPT_COPY_DONE)
#define RX_MATCH_COPIED_off(prog)       ((prog)->reganch &= ~ROPT_COPY_DONE)
#define RX_MATCH_COPIED_set(prog,t)     ((t) \
                                         ? RX_MATCH_COPIED_on(prog) \
                                         : RX_MATCH_COPIED_off(prog))

#define RX_MATCH_UTF8(prog)             ((prog)->reganch & ROPT_MATCH_UTF8)
#define RX_MATCH_UTF8_on(prog)          ((prog)->reganch |= ROPT_MATCH_UTF8)
#define RX_MATCH_UTF8_off(prog)         ((prog)->reganch &= ~ROPT_MATCH_UTF8)
#define RX_MATCH_UTF8_set(prog, t)      ((t) \
                        ? (RX_MATCH_UTF8_on(prog), (PL_reg_match_utf8 = 1)) \
                        : (RX_MATCH_UTF8_off(prog), (PL_reg_match_utf8 = 0)))
    
#define REXEC_COPY_STR  0x01            /* Need to copy the string. */
#define REXEC_CHECKED   0x02            /* check_substr already checked. */
#define REXEC_SCREAM    0x04            /* use scream table. */
#define REXEC_IGNOREPOS 0x08            /* \G matches at start. */
#define REXEC_NOT_FIRST 0x10            /* This is another iteration of //g. */
#define REXEC_ML        0x20            /* $* was set. */

#define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re)
#define ReREFCNT_dec(re) CALLREGFREE(aTHX_ re)

#define FBMcf_TAIL_DOLLAR       1
#define FBMcf_TAIL_DOLLARM      2
#define FBMcf_TAIL_Z            4
#define FBMcf_TAIL_z            8
#define FBMcf_TAIL              (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)

#define FBMrf_MULTILINE 1

struct re_scream_pos_data_s;